Whistle



(No Model.)

G. H. CROSBY.

WHISTLE.

No 357,702. Patented-Feb. 15, 1887 Invent-o7 v Gear e H Urolr ,3 K wit? min I .114 1/ 4/11 l I N. PETERS. Fhmuuw w. Washington, 0.1;

UNITED STATES PATENT OFFICE.

GEORGE HANNIBAL CROSBY, OF SOMERVILLE, MASSACHUSETTS.

WHISTLE.

SPECIFICATION forming part of Letters Patent No. 357,702, dated February 15, 1887.

Application filed April 29, 1885.

.To aZZ whom it may concern:

Serial No. 163,833. (No model.)

I case B, there being a passage, m, around the Be it known that I, GEORGE HANNIBAL "cylinder, into which passage the passage 76 CROSBY, of Somerville, in the county of Mid dlesex, of the Commonwealth of Massachusetts, have invented a new and useful Improvement in Whistles for either Locomo tives, Steamboats, Stationary Boilers, or Fire- Alarms; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which Figure 1 is a vertical and transverse section of one, and Fig. 2 a like section of another, construction of the valve-case of a steam-whistle having-my invention, the nature of which is defined in the claims hereinafter presented,

the whistlebell being shown as extending over such case.

In the said drawings, A denotes the said bell, and B its'valve-case. W'ithin such case there is fixed a stationary cylinder, 0, having at its closed end an educt, a, which in Fig. 1 is shown as curved. To this educt, at its outer end or part, there is a valve-seat, I), provided with a valve, 0, that is fixed to a stem or rod, d, at the inner end thereof. This stem extends length- Wise through a spiral spring, 6, a metallic washer, f, and a screw, 9. The spiral spring rests at oneend against the valve and at the other against the washer. The screw is screwed into the side of the case and against the washer, all being as represented. There is fixed on the rod (1, at its outer end, a knob or head, h, or some proper device for moving the rod. Furthermore,within the cylinder, and adapted thereto so as to closely fit the inner periphery thereof and to be capable of sliding therein, is a combined piston and valve, D, which in Fig. 1 is represented as a disk resting on the top of the valve-case induct E, whose internal diameter at the seat of the disk is less than the diameter of the said disk. In said Fig. 1 the induct E is shown as extending upward within the case B' and as having around the extension and below the valve D-a passage, 70, that extends downward through and opens laterally out of the supporter of the cylinder 0. Such supporter projects upward from the bottom of the case B, the cylinder 0 being screwed on such supporter and down to a shoulder, Z, thereon. The cylinder 0 has an external diameter less than the internal diameter of the a distance apart from one another and united by a stem or rod, 0, which projects beyond the lesser disk, a, into a guide, 12, extended from the inner surface of the case B. The induct E opens into the cylinder 0 atone side thereof and between the two disks m and n, and there is an opening, r, leading through the rear end of the cylinder into the case, as represented. A partition, 8, divides thespace over and at the rear end of the cylinder from the space below such cylinder. The diameter of the opening 1 is less than that of the disk at, and the diameter of the latter disk is less than that of the disk m, such disk at having a small hole, 11, extending through it.. The space over the cylinder 0 of Fig. 2 freely communicates through an opening, it, with the space a in advance of the head of the said cylinder.

In Fig. 1 the cylinder 0 is arranged vertically, or with its axis in range with that of the case and the whistlebell, while in Fig. 2 the cylinderO is arranged horizontally, or with its .axis at right angles to the axis of the case B and the whistle-bell.

Each of the two constructions shown in Figs. 1 and 2 and above described fully embodies my invention.

WVhen the steam in the boiler is in action on the combined piston and valve, steam will pass through the orifice 2' into the cylinder, and, as the piston D is larger in diameter than the induct E, Fig. l, or r, Fig. 2, the pistonvalve will be forced down upon its seat. If,

then, the valve 0 be drawn off its seat, not onlywill steam escape from the cylinder through the educt a and thence into the valve-case B, but the pressure on one side of the piston of the valve, tending to close such valve upon its seat, will be so suddenly diminished that the said valve, by the steam-pressure on the opposite side of the piston, will be forced off its seat and steam will escape into the valve-case. \Vith the construction shown in Fig. 1 the steam, on the valve being forced off its seat, will enter the passage la and pass through such into the space m, thence out of the top of the valve-case and against the lower edge of thewhistle-bell. \Viththeconstruction shown in Fig. 2, on the valve 0 being opened steam from the cylinder will escape into the space 1;, and thence through the opening t. The disk m being relieved from the pressure tending to move it in a direction to close the valve or disk it upon its seat, the steam-pressure against that side of the disk or piston m which is next the valve or will move the piston in the cylinder so as to cause it to draw the valve it off its seat and allow steam to escape through the opening rinto the space above the cylinder, and thence to the whistle-bell.

From the above it will be seen that the pressure 011 the boiler acts on the piston-valve when it is closed, and when by opening the supplementary valve the main valve is relieved of such pressuresuch main valve will be instantly opened by the pressure of the steam; also, that the piston-valve, the cylinder, and the suppleinentary valve are entirely inclosed within the case of the whistle, and that the steam escaping from either valve passes into and through the said case,thereby preventing any discharge outside of the case except through the opening in its top; also, that by means of the screw and spring the pressure of steam on the supplementary valve may be so nearly balanced as to enable the valve to be opened by a trifling force, such as that of an electro-magnet, for instance.

I do not claim a safety-valve having within its case a cylinder and in such cylinder at piston and spring, such piston being extended from the valve of the induct and educt of such case, and such spring acting on the piston to effect closing ofthe valve on its seat, all being as shown in the United States Patent No.23l,2l4, for in my improved whistle, as described, I have to the piston no such spring to be liable to injury or to become set or broken in use. In my steam-whistle the educt leads to the auxiliary valve of the cylinder, opens through the head, and not from one side of such cylinder, whereby the stem d of such auxiliary valve, as well as the screw 9, can be extended through the side of the case surrounding the said cylinder, and in consequence thereof can be operated to advantage. Besides, Ihave combined a steam-whistle case and bell with the stationary cylinder, and its main and auxiliary valves arranged within such case and to operate therewith, as set forth, such not being shown in said Patent No. 231,214; therefore,

I clain1- 1. The combination ofa steam-whistle. case and bell and a stationary cylinder arranged within the said case, and provided with an educt and a valve-seat and valve thereto, and with a spring and screw to regulate the press ure of such valve on its seat, as described,with a combined piston and valve arranged within such cylinder and applied to the steam-induct of the case, substantiallyasset forth,sueh combined piston and valve having a hole or passage for the steam to pass into the space between the piston and the seat of the firstnamed or auxiliary valve, and all being essentially and to operate as represented.

2. The combination of the stationary cylinder arranged within a steam-whistle case, and provided with an educt and a valve-seat and valve thereto, and with a spring and screw to regulate the pressure of such valve upon its seat, with a combined piston and valve arranged within such cylinder aud applied to the steam-induct of such case, and being without any spring between such piston and the cylinder-head, such combined piston and valve having a hole or passage for the steam to pass into the space between the piston and the seat of the first-named or auxiliary valve, and all being essentially and to operate as represented.

GEORGE HANNIBAL CROSBY.

Witnesses:

R. H. EDDY, ERNEST B. PRATT. 

